module/system/vm/debug.scm

   1 ;;; Guile VM debugging facilities
   2
   3 ;; Copyright (C) 2001 Free Software Foundation, Inc.
   4
   5 ;; This program is free software; you can redistribute it and/or modify
   6 ;; it under the terms of the GNU General Public License as published by
   7 ;; the Free Software Foundation; either version 2, or (at your option)
   8 ;; any later version.
   9 ;;
  10 ;; This program is distributed in the hope that it will be useful,
  11 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 ;; GNU General Public License for more details.
  14 ;;
  15 ;; You should have received a copy of the GNU General Public License
  16 ;; along with this program; see the file COPYING.  If not, write to
  17 ;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18 ;; Boston, MA 02111-1307, USA.
  19
  20 ;;; Code:
  21
  22 (define-module (system vm debug)
  23   #:use-syntax (system base syntax)
  24   #:use-module (system vm vm)
  25   #:use-module (system vm frame)
  26   #:use-module (ice-9 format)
  27   #:export (vm-debugger vm-backtrace))
  28
  29 \f
  30 ;;;
  31 ;;; Debugger
  32 ;;;
  33
  34 (define-record/keywords <debugger> vm chain index)
  35
  36 (define (vm-debugger vm)
  37   (let ((chain (vm-last-frame-chain vm)))
  38     (if (null? chain)
  39       (display "Nothing to debug\n")
  40       (debugger-repl (make-debugger
  41                       #:vm vm #:chain chain #:index (length chain))))))
  42
  43 (define (debugger-repl db)
  44   (let loop ()
  45     (display "debug> ")
  46     (let ((cmd (read)))
  47       (case cmd
  48         ((bt) (vm-backtrace (debugger-vm db)))
  49         ((stack)
  50          (write (vm-fetch-stack (debugger-vm db)))
  51          (newline))
  52         (else
  53          (format #t "Unknown command: ~A" cmd))))))
  54
  55 \f
  56 ;;;
  57 ;;; Backtrace
  58 ;;;
  59
  60 (define (vm-backtrace vm)
  61   (print-frame-chain-as-backtrace
  62    (reverse (vm-last-frame-chain vm))))